A multi-stage down-draft evaporative cool tower for semi-enclosed spaces. Part II: Water spraying system
Academic Article

Overview

Overview

abstract

In a conventional down-draft evaporative cool tower (DECT), dry ambient air is drawn in at
the top and cooler moist air is delivered at the bottom. Most of the cooling occurs near the
inlet, where water is introduced and air temperature approaches the wet bulb. A novel DECT
was developed which incorporates a secondary air inlet and complex longitudinal section
that comprises two partly overlapping cones. The complex section and the addition of a
secondary air intake near the middle required a sophisticated water spraying system. In
addition to maximizing the cooling potential, the spraying system was designed to limit spray
drift beyond the base of the tower, to reduce maintenance costs (especially due to clogging
of the sprayers) and to minimize pumping energy. Analysis shows that maximum cooling
may be obtained either by employing a very fine spray, requiring the introduction of a …